The flames heavily damaged the building. Investigators are trying to determine what sparked the blaze.

The other fire started about 11:55 p.m. Sunday at 3200 Polk near Velasco, just southeast of downtown, fire officials said.

Officials said the three-alarm blaze gutted portions of the building and a part of the roof collapsed. Nearby structures were exposed to the flames but firefighters contained the blaze to the warehouse. No injuries were reported.

Firefighters extinguished the flames about 1:10 a.m. Investigators are uncertain what caused the fire.